EEB337 20121115.docx

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University of Toronto St. George
Ecology & Evolutionary Biology

EEB337 20121115 Brassicaceae: - Mustard-oil glucosides effective in defence against bacteria, fungi, insects, mammals; cf. mustard, horse-radish, watercress (R = alkyl or other group)  Their role on the human diet  Mustard, Broccoli, cabbage, brussel sprouts, cauliflower, sprouts, etc - Flowers in usually bractless racemes, bisexual, hypogy2+2 decussate; 4 , diagonal to K; (2 short + 4(2)ng)yle (+and-)  Two short stamens and 4 long stamens are kind of enclosing to become one big pistil. - Syncarpous ovary with 2 locules separated by a thin replum connecting 2 parietal placentas, each with (1-) many ovules, developing into a dry-dehiscent fruit, the valves falling and revealing the replum and attached seeds:  Central replum structure with seeds attached  Result of two placenti growing together  At very early stage 4+2 is present  At much later stage, placenti grows towards the centre from the wall  4 petals and 6 stamens  Developing fruits at the tip of the inflorescent  Fruits mature on the bottom base first and the stalks are showing from fallen off seeds  Embryos of brassicaceae are sometimes folded up  Somewhat unusual genus: Cakile. It is well adapted in growing at very dry environments as with its fleshy leaves. Fruits that are produced are very unlikely:
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